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@teiten gieten atwt @frn SOLOMON W. KIRK, OF OOATESVILLE, PENNSYLVANIA.

Letters Patent 1Y0. 76,201, dated Ilfmch S1, 1868.

IMPROVEMENT IN LOCK-NUTS.

'lO ALL WI-IOM I'I MAY OONOERN:

Beit known that I, SOLOMON W. KIRK, of Coatesville, Chester county, Pennsylvania, have invented an Improvement in Retaining the Nuts of Bolts; and I do hereby declare the following to be a full, clear', and exact description of the same. Y

My invention .consists of a device described hereafter, whereby the nut of a bolt, after it has been screwed home, may be etfcctually prevented from turning.

In order to enable others skilled in the art to make and use my invention, I will now proceed to describe the mode of carrying the'eame into effect, reference being had tothe accompanying drawing, which forms apart of this specification, and in which- Figure l represents a bolt prepared for my improved nut-retainer.

Figure 2, the same, with the nut and its retainer. i

Figure 3, an end view of the bolt.

Figure 4, a top view of the nut.

Figure 5, a side View of the same.

Figure 6, a section of the nuten the diagonal line o o, tig'. 4.-; and

Figures 7 and 8, views ofthe retaining-ring.

A is the screw-stein of the bolt, and B the square head of the same. A flat surface is made on one side of the stem, as shown at as, tig. 3, for a purpose' explained hereafter. i

The upper surface ofthe nut is recessed inthe centre, and at the four points 3' 3 3 3, so as to lcaveat each corner of the nut a projection, a, the concaveinner edge of which is bevelled inwards, as shown in iig. 6.

D is the retaining-ring, ofthe concave-convex form represented in iig. 8, the ring being of such external diameter that it will it snugly between the inner edgesof the projections a a of the nut, the internal diameter being such that the ring'will pass freely over the screwed portion of the stem of the bolt.. There is, however, a straight portion, y, in the ring, adapted to the ilat portion, x, of the bolts stem.

After the nut has been screwed tight home, the ring D is passed, concave side downwards, over the screwed portion of the stem, the straight portion, y, of the ring, being in contact with thetlat portion of the stem until the ring is finally lodged in the recess ot' the nut. By a suitable instrument applied to the convex side of the ring, and by blows imparted to the instrument, the ring is flattened, and consequently increased in diameter, so that itsbevclled edges are driven tightly against the bevellcd inner edges of the projections a of the nut; in other words, the ring is jammed 'tight tothe nut, which cannot be turned until the ring is forcibly removed.

I claim as my invention, and desire to secure by Letters Patent- The within-described nut-retainer, consisting of the concave-convex ring D, having a straight portion, y, adapted to a Jdat place on the stem ofthe bolt, and being arranged for fitting, and beingjammed in the recess of a nut, all substantialiy as set forth.

In testimony whereof, I have signe-'l my name to this specification in the presence of two subscribing witnesses.v

S. W. KIRK.

Witnesses:

E. L. Bonursnun, WM. ALBERT STEEL. 

